Looking good, Nordic.
Lovely vintage look, reminds me of old guitar-amps and tube-gear.
The hammertone you're referring to, is it like this (this is the grey variety) ? We call it hamerslag overhere.
Gives a very nice rugged look

Because VBE multiplier turn standard, some adjustments will need revision.

The bias trimpot must be adjusted to 700 ohms .

The offset trimpot must be adjusted to 7400 ohms.

Multiturn trimpot will be very helpfull.

The instructions will produce 80 to 110 miliamperes of stand by bias current...idle current....but you may find a better operation point to your transistors tweaking this current to lower values...listening to low level music and searching for quality.

Nordic and Klaas found that 80 to 110 miliamperes is a little bit big compared with their adjustments.

Of course the standard adjustment will work...but if you want to tune it to the best possible performance...use your ears and make small adjustments....and do that will very small volume, also keep those 10 ohms resistances in series with the supplies, because of safety reasons, during your low volume adjustments.

Finally.... after "fine tuning"...remove the resistances.

The amplifier cannot distort when playing very low volume music.

regards,

Carlos

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9 ........... Install two multimeters connected across each of the protective resistors—see diagram below.

We are measuring the voltage that develops across the protective resistors when a current flows. Because of the zener diode, Z1, the bias current in the positive rail will be just a bit higher, about 10 milliamps, than the negative rail.

10.......... Turn the power on.

11.......... Adjust the bias (VR2) to between 800 and 1,100 millivolts (0,8 and 1,1 volts) on each rail.